阅读说明：本技术 一种用于钛合金表面具有持续减摩抗磨功能的纳米混合材料 (Nano mixed material with continuous friction reduction and wear resistance functions for titanium alloy surface ) 是由 周银 周顺情 陈博文 王树奇 郭沁涵 于 2019-09-02 设计创作，主要内容包括：本发明提供了一种用于钛合金表面具有持续减摩抗磨功能的纳米混合材料,所述的纳米混合材料是以作为抗磨组分的纳米氧化物颗粒和作为减摩组分的润滑剂为原料混合制成。本发明的纳米混合材料具有如下技术效果：1)用于钛合金表面时,能够同时抗磨和减摩,可以彻底改善钛合金在严酷工况条件(如高载荷)下摩擦磨损性能。2)与中国专利CN201611018013.7相比,具有持续发挥减摩抗磨的功能。(The invention provides a nano mixed material with continuous antifriction and antiwear functions for a titanium alloy surface, which is prepared by mixing nano oxide particles serving as an antiwear component and a lubricant serving as an antifriction component. The nano mixed material of the invention has the following technical effects: 1) when the titanium alloy is used on the surface of the titanium alloy, the titanium alloy can resist wear and reduce friction at the same time, and the friction and wear performance of the titanium alloy under severe working conditions (such as high load) can be thoroughly improved. 2) Compared with the Chinese patent CN201611018013.7, the anti-friction and anti-wear rubber has the function of continuously playing the anti-friction and anti-wear functions.)

1. A nanometer mixed material with continuous antifriction and antiwear functions for the surface of titanium alloy is characterized in that the nanometer mixed material is prepared by mixing nanometer oxide particles as an antiwear component and a lubricant as an antifriction component;

the nano oxide particles are selected from one or more of ferric oxide, ferroferric oxide, titanium monoxide, titanium dioxide and aluminum oxide, and the nano oxide particles must contain ferric oxide;

the lubricant is selected from one or more of multilayer graphene, molybdenum disulfide and graphite, and must contain the multilayer graphene;

the percentage content of the nano oxide particles in the mixed material is 20-30% w/w;

the percentage content of the lubricant in the mixed material is 70-80% w/w;

when other oxide particles besides ferric oxide exist in the nano oxide particles, each antiwear component can be calculated according to any mass ratio;

when the lubricant contains other lubricants besides the multilayer graphene, all the antifriction components can be calculated according to any mass ratio;

the number of the layers of the multilayer graphene is 10-50;

the addition amount of the nano mixed material is 0.2-0.5 mg/mm²。

2. The nano-hybrid material with the functions of continuously reducing friction and resisting wear for the surface of the titanium alloy as claimed in claim 1, wherein in the nano-hybrid material, the nano-oxide particles are ferric oxide, the percentage content in the hybrid material is 30% w/w, the lubricant is multi-layer graphene, the percentage content in the hybrid material is 70% w/w, and the number of layers of the multi-layer graphene is 50.

Technical Field

The invention relates to a nano mixed material with continuous antifriction and wear-resistant functions for the surface of a titanium alloy, belonging to the technical field of materials.

Background

The application of titanium alloy begins in the 50 s of the 20 th century, develops rapidly due to a series of excellent performances, and is widely applied to various fields of aerospace, navigation, automobiles, energy sources, chemical industry, biomedicine and the like. However, the poor wear resistance and frictional lubricity of titanium alloys limits their engineering applications in areas involving frictional wear.

Surface treatment is always considered to be an effective way for improving the frictional wear performance of the titanium alloy, but the high cost, the complex process and the severe working conditions such as high load, high speed and the like of the surface treatment are always subjected to the defects of cracking, peeling and the like caused by stress or thermal stress, and the surface treatment is always subjected to the defects. Based on this, research on the surface treatment of titanium alloys is gradually shifted to research on its own tribological properties. The friction layer formed during wear of the titanium alloy is metallic and does not have a protective effect when the friction layer resulting from sliding conditions contains no or only trace amounts of oxides, which is the root cause of the poor wear resistance of the titanium alloy.

From the perspective of the friction layer, changes in sliding conditions may cause the friction layer to change thereby affecting wear performance. In recent years, some researchers at home and abroad have new cognition when further exploring the dry sliding friction and wear performance of the titanium alloy, and under special conditions such as high temperature and high speed, a friction layer containing oxide is formed on the surface of the titanium alloy, and the friction layer belongs to ceramic properties and has a protection effect, so that the wear resistance of the titanium alloy is improved.

However, the ceramic-based friction layer caused by the change of the sliding condition has some limitations or negative effects while exerting an effective protective effect, for example, it must be formed under specific conditions, but hardly under normal conditions; the formation of the friction layer is based on the consumption of the base material of the friction pair, which causes the abrasion of the material; more importantly, the ceramic nature of the friction layer is effective in reducing wear, but not always at the same time.

Chinese patent CN201611018013.7 is an antiwear and antifriction material, in particular to an oxide-containing self-lubricating nano mixed material for antiwear and antifriction of titanium alloy. The material comprises 33-83% of antiwear agent and 17-67% of antifriction agent. Wherein the antiwear agent is ferric oxide nano-particles, and the antifriction agent is multilayer graphene. The two nano materials are mixed and stirred uniformly and then are directly added to the sliding interface of the titanium alloy component to form the self-lubricating oxide-containing nano material. It has the following disadvantages: in the mixed material, the proportion of the lubricant is low, and on the basis of ensuring enough bearing capacity, the lubricating capacity is not strong enough, namely the friction-reducing and wear-resisting functions can not be continuously exerted. In addition, the lubricant has a small number of multi-layer graphene layers, so that the sliding friction force between the graphene layers is relatively large, and the friction layer induced in the patent CN201611018013.7 does not have a durable friction reducing function.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a nano mixed material which is used on the surface of a titanium alloy and has the functions of continuous friction reduction and wear resistance.

The present invention is an improvement over the closest prior art as follows:

(1) the ferric oxide and the multilayer graphene are made into a mixed material, so that the component content of an antifriction component in the friction layer is improved, and the continuous antifriction and antiwear functions are generated;

(2) and selecting multi-layer graphene with different layers to prepare the nano mixed material, and inspecting the continuity of the friction layer, namely the time (sliding distance) for the friction layer to continuously exert an effective action.

The technical scheme of the invention is as follows:

a nanometer mixed material with continuous antifriction and antiwear functions for the surface of titanium alloy is prepared by mixing nanometer oxide particles as an antiwear component and a lubricant as an antifriction component;

the nano oxide particles are selected from one or more of ferric oxide, ferroferric oxide, titanium monoxide, titanium dioxide and aluminum oxide, and the nano oxide particles must contain ferric oxide;

the lubricant is selected from one or more of multilayer graphene, molybdenum disulfide and graphite, and must contain the multilayer graphene;

the percentage content of the nano oxide particles in the mixed material is 20-30% w/w;

the percentage content of the lubricant in the mixed material is 70-80% w/w;

when other oxide particles besides ferric oxide exist in the nano oxide particles, each antiwear component can be calculated according to any mass ratio;

when the lubricant contains other lubricants besides the multilayer graphene, all the antifriction components can be calculated according to any mass ratio;

the number of the layers of the multilayer graphene is 10-50;

the addition amount of the nano mixed material is 0.2-0.5 mg/mm²。

Preferably, the first and second electrodes are formed of a metal,

in the nano mixed material, the nano oxide particles are ferric oxide, the percentage content in the mixed material is 30% w/w, the lubricant is multilayer graphene, the percentage content in the mixed material is 70% w/w, and the number of the multilayer graphene layers is 50.

The existing conventional method forms the anti-wear substance by surface treatment or chemical reaction of surface elements of titanium alloy, and the method has a plurality of defects, such as: the cost is high; the environmental pollution is serious; must be formed under specific conditions, but hardly under conventional conditions; the formation of the friction layer is based on the consumption of the base material of the friction pair, which causes the abrasion of the material; more importantly, the ceramic nature of the friction layer is effective in reducing wear, but not always at the same time.

Before the sliding test is started, the nano mixed material is directly poured on a sliding interface and shaken up, and in order to prevent the nano material from agglomerating or splashing, a disk sample can be properly modified, namely a cylindrical foam is pasted at the center of the disk, and a layer of hard adhesive tape is adhered around the disk. The mixed material is promoted to be adsorbed to the surface of the titanium alloy through sliding friction, and a friction layer is formed through a series of processes of aggregation, sintering, compaction and the like, so that the functions of friction reduction and wear resistance are exerted.

The nano mixed material is added on the sliding interface, and the surface of the titanium alloy can be artificially induced to form a functional gradient friction layer, namely a double-layer structure, wherein the friction layer which is close to the matrix (lower layer) and takes the oxide as the main component, and the friction layer which is close to the grinding surface (upper layer) and takes the lubricant as the main component. The lower friction layer plays a bearing role and supports the upper friction layer, and the upper friction layer plays a lubricating role and protects the lower friction layer from being abraded. The two friction layers are mutually cooperated to achieve the effects of friction reduction and wear resistance, and the friction and wear performance of the titanium alloy is obviously improved.

When the lubricant-rich nano mixed material is added, namely the lubricant (especially multilayer graphene) in the mixed material has a high proportion, the antifriction component content in the gradient friction layer, especially the upper friction layer, is high, and the titanium alloy can keep extremely low wear rate and friction coefficient for a long time. Similarly, when the number of the layers of graphene in the added nano-hybrid material is large, the sliding friction force between the graphene layers is reduced, and the upper friction layer can be promoted to continuously maintain excellent lubricating performance.

The nano mixed material of the invention has the following technical effects:

1) when the titanium alloy is used on the surface of the titanium alloy, the titanium alloy can resist wear and reduce friction at the same time, and the friction and wear performance of the titanium alloy under severe working conditions (such as high load) can be thoroughly improved.

2) Compared with the Chinese patent CN201611018013.7, the anti-friction and anti-wear rubber has the function of continuously playing the anti-friction and anti-wear functions.

Drawings

FIG. 1 is a graph of the wear rate of TC11 alloy as a function of sliding distance without addition, with addition of only multi-layer graphene, with addition of only iron trioxide, and with addition of the nanocomposite of examples 1-3;

FIG. 2 is a graph of the coefficient of friction of the sliding system without addition, with addition of only multi-layer graphene, with addition of only iron trioxide, and with addition of the nano-hybrid materials of examples 1-3;

FIG. 3 shows the morphology of the surface gradient friction layer of the TC11 alloy when the nanometer mixed material of the embodiment 1 is added.

Detailed Description

The present invention will be described in further detail with reference to specific examples.